Dissociation energies of GdO, HoO, ErO, TmO, and LuO; correlation of results for the lanthanide monoxide series

Publisher Website
Google Scholar
Abstract
High temperature gaseous reaction equilibria involving GdO, HoO, ErO, TmO, LuO, and certain reference oxides have been studied by mass spectrometry, using a molecular effusion beam source. From the reaction thermochemistry, the dissociation energies, D00, were derived as 169.5±3 kcal/mol (GdO), 144.1±3 kcal/mol (HoO), 143.9±3 kcal/mol (ErO), 121.8±3 kcal/mol (TmO), and 159.4±2 kcal/mol (LuO). Some of these values differ substantially from previous determinations. However, the new results together with several recent determinations and re-evaluations yield a consistent set of results for the entire series from LaO to LuO. Trends in D00 values across the series can be correlated remarkably well with changes in the 4fn6s2→4fn−15d6s2 electronic promotion energies in the gaseous metal atoms. Various aspects of the bonding are discussed.